I have been using the XL300 with my CNC laser setup for the past year. I originally started with the ducting on the back side of the laser which actually had enough power to extract the fumes and off-gasses from the laser. However, as I have expanded to bigger projects and the gantry was moving more I decided to build an enclosure with the exhaust evacuated at the top and back. This allowed for me to run the XL-300 at half speed. I can note that with the system operating I definitely cannot smell any fumes while the machine is running which is great! I highly recommend this unit.
The unit operates extremely quietly which is great. It is so quite I often forget to shut the system machine off after I have had a production run.
The unit is nice and compact which doesn't take up too much area in my shop which is a bonus.
The only down side from this was that when I received the machine, one of the casters was missing so it has a slight lean to it. I do not believe this was the fault of the manufacturer but more of the shipping as the box was a little beat up and there was a hole in the bottom corner when I received it.